package com.carl.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

//替换httpServlet
public class BaseServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取方法名
        String URI = req.getRequestURI();
        System.out.println(URI);
        int index = URI.lastIndexOf('/');
        String methodName = URI.substring(index + 1);
        System.out.println(methodName);

        /*
        执行方法
        利用反射来调用
         */
        Class<? extends BaseServlet> cls = this.getClass();
        try {
            Method method = cls.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            req.setCharacterEncoding("utf-8");
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}
